No, on smartphones not after yesterday's YouTube update.
Now you'll have to do it on a laptop or desktop PC and transfer it then to your Android device.
But YouTube videos are between 1,000 and 10,000 times the size of their URLs/links. Storing YouTube videos on a mobile device seems like a massive waste of storage space to me when a URL/link gets you the same video...

No, on smartphones not after yesterday's YouTube update.
Now you'll have to do it on a laptop or desktop PC and transfer it then to your Android device.
But YouTube videos are between 1,000 and 10,000 times the size of their URLs/links. Storing YouTube videos on a mobile device seems like a massive waste of storage space to me when a URL/link gets you the same video...

I am still able to use YouTube Downloader I am rooted and running X-Note Rom, the same update was applied and uninstalled and I have very recently downloaded.

As for urls that's true obviously takes up less space but not all have home broadband to stream or decent mobile speeds. So like me I steal my Bros Internet to download and then watch at home.